Check babeltrace1 stderr output in tests
Currently, babeltrace1 stderr's output contains warnings which are not checked by the tests. Those do not fail the overall babeltrace execution, but end up being unexpected regressions when they appear between releases.
We could modify all babeltrace invocations to add a helper which saves the stderr output, and check that it is empty after babeltrace has completed execution. If non-empty, a test error would be reported.
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